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13. John has entered into 25 long futures contracts on a certain stock index. Each contract is for 80 shares of the index. The initial margin is 20%, and the maintenance margin is 90% of the initial margin. John's margin account earns interest at a continuously compounded rate of 9%. The account is marked-to-market monthly. At the time when Jordan enters the contracts, the price of the stock is S. At the end of the first month the price of the stock is 158, and Jordan receives a margin call in the amount of 22,559.05. Find S